Patent GB-1229701-A (GB)
IPC: B21F1/00
Filed: 1969-01-08
Abstract: 1,229,701. Making windings; angular bending. NAUCHNO - ISSLEDOVATELSKY I EXPERIMENTALNY INSTITUT AVTOMOBILNOGO ELEKTROOBORUDOVANIA KARBJURATOROV I PRIBOROV. 8 Jan., 1969, No. 1198/69. Headings B3A and B3E. A machine for making single-turn wire loop sections and placing the sections into slots of an electrical machine comprises a mechanism 13 for extending the sections and a mechanism 27 for moving apart the end portions of the sections, each of the mechanisms having an external cylinder 14 or 28 and an internal cylinder 15 or 29 arranged concentrically and mounted for rotation and for axial displacement in relation to each other, the external cylinder 28 for moving apart the end portions of the sections having an annular projection 32 at the end thereof which is adapted in the cause of moving apart the end portions to enter between the external and internal layers of the end portions of the sections placed into the slots. In operation the wire 2 is fed intermittently by pivoting lever 50 to the right (as seen in Fig. 1) which moves a lever 51 to clamp the wire against a slide after which the lever 51, the slide and the wire are moved to the right. A guide 4 directs the wire, which has been straightened by a closure 3, to a mechanism 5 which cuts the wire and tapers the ends. Each blank is fed into a recess in the edge of a reciprocating plate 8 which moves the blank to the work station where the blank is to be bent into a loop. The plate 8 is then withdrawn and a mandrel 9 is lowered between the blank and the plate 8. The blank is bent by pivoting a plate 10 about the mandrel and then advancing a plate 11 against the bent blank to push the two legs of the U together. Then the mandrel 9 is raised and the loop is moved by a pusher 12 into a pair of splines 16 of the coaxial cylinders 14 and 15 of mechanism 13. When all the pairs of splines have been filled the mechanism 13 is drawn into a position aligned with a section transfer mechanism 21. The cylinders 14 and 15 are rotated in opposite directions by an angle greater than that required between the legs of the sections in an armature 25. Simultaneously with the relative rotation of the cylinders 14 and 15, a threaded connection 19 effects their relative axial displacement so that the set of sections received in the splines 16 are extended. The cylinders 14 and 15 are then rotated back to a position in which the angular displacement between the splines of a pair is equal to the required angle between the legs of the section in the winding so as to relieve contact tension between the cylinder and the bends of the wire sections. The sectional transfer mechanism 21 is drawn towards the mechanism 13 and a mandrel 22 enters the front end of the sections while abutments of a collet 23 are received between head portions of the sections and press the head portions against the mandrel 22. The transfer mechanism 21 is retracted by a small amount so that the projected sections are retained in slots in the ends of guiding fingers 24 after which the mechanism 21 is fully retracted. The mechanism 13 is then moved back to its initial position. The mechanism 27 is moved towards the armature 25 until the projection 32 bears against the end of the armature after which the transfer mechanism 21 moves towards the armature to drive the winding sections into the slots of the armature. The end portions of the legs of the sections, after passing through the armature 25 are received in splines 30. The cylinders 28 and 29 are rotated in opposite directions by an angle which exceeds by a small amount the desired angle between the section ends in the winding, a threaded connection 33 causing relative axial displacement of the cylinders which bend the end portions of the sections of the winding to the desired shape. The cylinders 28 and 29 are then turned back to a position in which their relative angular displacement is equal to the desired angle between the section ends of the winding, thus relieving contact tension between the bands of the sections and the cylinders.